Wiktionary
adv. (context UK English) (alternative form of on second thought English)
Usage examples of "on second thoughts".
I remember that I laid down the basket full of diamonds, wishing to be rid of its weight, but on second thoughts took it up again.
It's a pity in a way, I wanted to keep our tame Kraut around a little longer, but on second thoughts it's time for him to go….
Says I, on second thoughts, 'I guess I won't kick you, old fellow.
But, on second thoughts, perhaps Lizzy could tell us, what relations he has now living, better than any other person.
The mention of the thing he thought he perceived was involuntary on Sam's part at first, and his confused attempts to dissuade him he set down to a desperate lying on second thoughts, as being unwilling to implicate Eliza.
However, on second thoughts, she made up her mind to go on: “.